| 摘要 |
PURPOSE:To provide a secondary cell whose output and cycle life are high and long, respectively, and in which no dendrite is educed on a negative electrode even at a high electrical current density, by making the negative electrode of a porous carbonaceous material having a prescribed mean spacing for the crystalline portion thereof and a prescribed specific surface area. CONSTITUTION:A negative electrode is made of a porous carbonaceous material whose specific surface area according to the nitrogen adsorption BET method is 100-1,000m<2>/g and whose mean spacing of the crystalline portion thereof according to the X-ray diffraction method is 3.7Angstrom or more. The negative electrode is used to provide a secondary cell whose output and cycle life are high and long, respectively, and in which no dendrite is educed on the electrode even at a high electrical current density. If the specific surface area of the porous carbonaceous material were less than 100m<2>/g, dendrite would be likely to come about as the electrical current density increases. If the specific surface area where more than 1,000m<2>/g, the coulomb efficiency of the cell would be lower. |
